package chapter05.E9;

public class E9 {
    private static final int TIMES = 100000;
    public static void main(String[] args) {
        testString();
        testStringBuffer();
        testStringBuilder();
    }
    public static void testString() {
        long startTime = System.currentTimeMillis();
        String str = "";
        for (int i = 0; i < TIMES; i++) {
            str += "test";
        }
        long endTime = System.currentTimeMillis();
        System.out.println("String test usedtime: " + (endTime - startTime));
    }
    public static void testStringBuffer() {
        long startTime = System.currentTimeMillis();
        StringBuffer str = new StringBuffer();
        for (int i = 0; i < TIMES; i++) {
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuffer test usedtime: " + (endTime - startTime));
    }
    public static void testStringBuilder() {
        long startTime = System.currentTimeMillis();
        StringBuilder str = new StringBuilder();
        for (int i = 0; i < TIMES; i++) {
            str.append("test");
        }
        long endTime = System.currentTimeMillis();
        System.out.println("StringBuilder test usedtime: " + (endTime - startTime));
    }
}
